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The United States is currently experiencing its worst measles outbreak in more than three decades, with 1,288 confirmed cases reported so far in 2025, according to the US Centers for Disease Control and Prevention (CDC). This figure surpasses the previous high of 1,274 cases in 2019 and marks the most significant surge since 1992. The outbreak has affected more than two-thirds of US states, with 27 outbreaks—defined as three or more related cases—reported nationwide.
have been attributed to the outbreak since January, including two unvaccinated children in Texas. The majority of cases have occurred among unvaccinated individuals, highlighting the critical role of vaccination in preventing the spread of this highly contagious disease.
Health experts have linked the current surge to a decline in childhood vaccination rates. For the 2023-2024 school year, the CDC reported that vaccination coverage among kindergarteners fell below 93%, down from 95% in the 2019-2020 school year. This drop is significant because at least 95% vaccination coverage is needed to maintain herd immunity and prevent outbreaks.
The epicenter of the outbreak has been in West Texas, particularly among Mennonite communities that often seek religious exemptions from vaccine mandates. Texas alone has reported 753 cases since January. The outbreak has also spread to New Mexico, Oklahoma, and Kansas.
Public health officials have expressed concern that ongoing declines in vaccination rates could lead to a dramatic increase in measles cases in the coming years. A recent study published in the Journal of the American Medical Association warns that if current trends continue, the US could see more than 50 million cases over the next 25 years.
The CDC and World Health Organization (WHO) have both issued advisories urging all travelers to ensure they are fully vaccinated against measles before traveling, as international travel remains a significant source of new cases.
The CDC emphasizes that the measles, mumps, and rubella (MMR) vaccine is 97% effective after two doses and remains the best defense against the disease. Symptoms of measles typically appear seven to 14 days after exposure and include high fever, cough, runny nose, and a characteristic rash.
“Once we see a resurgence of measles, we know that other diseases are going to come behind it,” said Dr. Eric Ball, a leading pediatrician.
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This article is based on information available as of July 10, 2025, and reflects the latest data and expert opinions at the time of writing. The situation regarding measles outbreaks and public health guidance may evolve. For the most current information and personal health advice, please consult official sources such as the CDC or your healthcare provider.
